/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.breaker;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Locale;
import java.util.function.ToLongFunction;

import io.crate.data.Row;
import io.crate.types.DataType;

public final class EstimateRowSize implements ToLongFunction<Row> {

    private final ArrayList<SizeEstimator<Object>> estimators;

    public EstimateRowSize(Collection<? extends DataType> columnTypes) {
        this.estimators = new ArrayList<>(columnTypes.size());
        for (DataType<?> columnType : columnTypes) {
            estimators.add(SizeEstimatorFactory.create(columnType));
        }
    }

    @Override
    public long applyAsLong(Row row) {
        assert row.numColumns() == estimators.size()
            : String.format(Locale.ENGLISH, "row.numColumns=%d estimators.size=%d - the number must match. ", row.numColumns(), estimators.size());
        long size = 0;
        for (int i = 0; i < row.numColumns(); i++) {
            size += estimators.get(i).estimateSize(row.get(i));
        }
        return size;
    }
}
